Grinding-mill



2Sheets-Sheet 1. W. B. PARDEE.

- Grinding-Mill. l No. 226,777. i Patented April 20, 1880.

MPETERS, PNOYO-LJTHOGRAPHER, WASMXNGTUN, D C.

W. B.. PARDEB.

Grinding-Mill.

Patented. April 20, 1880. I

l Jgd? NAPEIERS. PHOTO-UTHOGRAPHEIL WASHINGTON, D. C,

2- Sheets-Sheet 2.

UNITED STATES PATENT," Ormea,

WILLIAMv B. PARDEE, F NEW HAVEN, CONNECTICUT.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 226,777, dated April20, 1880.

Application filed March 17, 1879.

To all whom t may concern Be it known that I, WM. B. PARDEE, of NewHaven, in the county of New Haven and State of Connecticut, haveinventeda new Improvement in Grinding-Mills; and I do hereby declare thefollowing, when taken in connection with the accompanying drawings andthe letters of reference marked thereon, to be Y a full, clear, andexact description of the same,

and which said drawings constitute part of lhis specification, andrepresent, in

Figure l, a longitudinal central section; Fig. 2, an end view; Figs. 3,4, 5, 6, 7, and 8, detached views. l

This invention relates to an improvement in that class of grinding-millsin which a spindle is arranged horizontally, so that the runner-stonerevolves in a vertical plane; and it consists in details ofconstruction, as hereinafter described, and particularly recited in theclaims.

A is the bed or base of the machine, forming the lower half of theshell; B, the upper halt' of the shell, the division between the twoparts being in a horizontal central plane, the two parts securedtogether in the usual manner. On the base are bearings A' for thesupport of the spindle C, the spindle being made to revolve by theapplication of power thereto through the pulley C' or otherwise. D, therunner-stone case, is constructed at its center with a hub, D', and thishub screw-threaded upon its interior to tit a corresponding screwthreadon the spindle C. Longitudinally on the threaded portion of the spindleakey-slot is cut, and a corresponding' key-slot on the interior.threaded surface of the hub to receive a key, a, as seen in Fig. 3.

By this construction the runner-stone case may be adj ustedlongitudinally on the spindle, to set the runnerstone D2, whichitcarries, nearer to or farther from the bed-stone E without longitudinalmovement of the spindle, a single revolution of the runner-stone case onthe spindle giving as close an Aadjustment as would be ordinarilyrequired; but key-slots may be cutat different points for niceradjustment, if desirable. This adjustment, it will be understood, isonly required where a considerable movement ofthe runner-stone isdesirable-as, for instance, the first adjustment after a change ofstones, or after a consider-v able portion of the grinding-surface hasbeen. cut away, or when for any cause the ordinary tine adjustment ofthe spindle has been eX- hausted.

The bed-stone E is arranged inits case E', and this case is provided ateach side with a trunnion, b, resting in a bea-ring, d, in a seat formedfor it in the lower part ofthe shell, as seen in Figs. 4 and 5. The seatis broader than the bearing, and the sides of the bearing inclined. Ateach side of the bearing a wedge, e, is arranged, each wedge having itsown independent adj Listing-screw j', so that by raising one of thewedges and drawing down the other the bearing dwill be movedaccordingly, and correspondingly move the bed-stone to or from therunner-stone, as the case may be.

The adjustment of the bed-stone through the trunnion I) moves the stonebodily, or can only change its horizontal plane. It frequently occursthat it is necessary to adjust the plane of the bed-stone with relationto that of the runner. To do this adjusting-screws g are introducedthrough the end of the shell at points above and below the center, tobear against the outer surface of the bed-stone case; hence bywithdrawing the adjusting-screws above the center and turning in thosebelow, or vice versa, the vertical plane of the bedstone will be changedaccordingly.

0n the outer surface of the bed-stone case there is made an annular rib,h, and corresponding to this an annular rib, t', within the shell, (seeFig. 1,) and arranged so as to run very nearly together, one overlappingthe other. These ribs h z' prevent any material from the mill passing inbetween the bed-stone case and the shell, and therefore aid in keepingthe mill clean.

F is the hopper, from which a conductor, F', leads the grain to theopening through the bedstone. In order to give to the grain a positivefeed and avoid the usual shaker, afeed-wheel, F2, is arranged in theconductor F', the surface oi' which is iiuted, toothed, or otherwiseprovided with cavities, and to this wheel an intermittent rotarymovement is imparted from a worm, F3, on the spindle, working into IOO apinion, F4, and from an eccentric pin, f', on this wheel a rod, f2,connects with a lever, F5, hung upon a shaft, f3, carrying abevel-pinion, F6, which works into a corresponding bevelpinion, F7, onthe shaft of the feed-wheel F2. The lever F5 carries a pawl, f4, whichworks into a ratchet-wheel, f5, on the shaft of the pinion FG, so thatat each revolution of the wheel F4 the ratchet f5 is turned one tooth,imparting to the feed-wheel a corresponding partial and intermittentrotation.

Within the conductor is a hinged or spring' gate, G, (see Fig. 6,) thespace between which and the feed-wheel F2 forms the throat for thepassage of the grain, the wheel working substantially agaii'lst thesurface of the gate. The position of the gate is made adjustablerelative to the wheel by a set-screw, G. By this device the feed is madepositive and regular.

To ventilate the mill-that is, to supply it with a circulation of airnecessary to the proper working of tlouring mills severalradiallyprojecting blades, n, are arranged on the outer surface of therunner-case and corresponding blades m on the back of the case, and sothat the rot-ation of the runner creates a circulation between the caseand shell, drawing air into the case and throwing it out through anopening, H, at the top. This opening is protected by gauze to preventthe possibility of the flour passing out, and it is also provided with aplate or cover, L, which may be dropped down upon and so as to close theopening H, should it at any time be desirable. This arrangement willexpel the heat which will be generated in the mill, and by providing thecase with openings below air from the outside will be drawn in andpassed through the mill. One of such openin gs is shown at m.

The thrust ofthe stone is supported against a step, N. This step isarranged in a socket, N', the head N2 of which rests against a spring,s, the strength of this spring being sufficient to hold against thethrust ofthe runner-stone when at work, but yet yield should any hardforeign substance pass in between the stones.

The step N is adjustable by a set-screw, N3, y

introduced into the outer end ofthe sleeve N, to bear against the outerend of the step and' force it inward or permit it to move outward. Thespring s is adjustable by a nut, s', on Vle outer end of the sleeve.

To lubricate the step a chamber, T, is formed around the step and aroundthe end ofthe spindle, as seen in transverse section, Fig. 7.

The end of the step which bears against the spindle has an openingleading from its center at the spindle back and upward through the sideof the step, as seen in Fig. l, and also seen in Fig. 8 enlarged.

The chamber Tis filled with lubricating material nearly up to thespindle, and on the spindle a dipper, t, is arranged so as to revolvewith the spindle, and in revolving extends nearly to the bottom of thechamber T, so as to dip into the lubricating material and take aportion. at each revolution, and because of its rapid revolution it willthrow upward the lubricating material thus taken up, and at the top ofthe chamber a drip, t, is arranged over the step to receive thelubricating material thrown by the clipper, and from this drip thelubricating material will drop onto the step and work its way betweenthe step and end ofthe spindle.

The feed-screw P onthe spindle, which serves to work the grain from thefeed-spout into the mill, is usually made of equal diameter throughout,and only sufficient to clear the lower end ofthe feed-spout, andconsiderably less diameter than the opening through the bed-stone. Hencethe screw does not serve to completely clear the grain from the openingin the bedstone. To obviate this difficulty I make the screw P ofincreasing diameter from the opening in the feed-spout int-o the openingin' the bed-stone, and so that the inner turn or turns of' the threadwill run as close as practicable to the surface of the opening in thebed-stone, as shown in Fig. l. Hence the screw not only .clears thegrain from the feed-spout, but carries it onward through the opening inthe bedstone.

I do not wish to be understood as claiming any of the parts shown anddescribed, except in the combination as hereinafter specified.

I claiml. In a grinding-mill, the taperingfeed-screw P on the spindle,combined with the feed-spout F and the opening in the bed-stone,substantially as and for the purpose described.

2. The combination of the headed sleeve N', its nut s', spring s, stepN, adj Listing-screw N3,

and spindle of the mill, substantially as described.

i WM. B. PARDEE.

Witnesses:

JOHN E. EARLE, Jos. G. EARLE.

IOO

